Improvement in oval-turning tool



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JOHN L. WARREN, OE DETROIT, MICHIGAN, ASSIGNOR .TO GEORGE HAR- GREAVES AND SAMUEL HARGREAVES, OF SAME PLAGE.

Letters Patcnft'No. 101,329, dated March 29, 1870.

IMPROVEMENT IN OVAL-TURNING- TOOL.

The Schedule referred to in these Letters Patent and making part 0f the same- To whom'it may concern:

v upon which the gibbed frame vibrates.

Figure 4 is au elevation of the inner side of my cutter-head.

Like letters indicate like parts in each figure.

The nature of this invention relates to an improved construction of lathes for turning oval 'and' circular frames in wood; and consists in a metallic cap secured to the top of the cutter-head, covering the knives, and conforming to the outline of their cutting edges, yet

leaving a space between said cap and said knives for the passage of shavings, and in combination therewith, the arrangement ofthe knives upon the cutter-head.

In the drawings- A represents -a proper frame, having two standards B B' in proper bearings, in which is journalcd the mandrel C, rotated in a convenient manner,'and carrying on its front end the quadrangular slide D rigidly secured thereto isa circular disk of metal provided with a horizontal slot through which projects the mandrel G. It is also provided with smaller hor-` on the face-plate, which is effected by setting the ceu ter of the disk li away from that of the mandrel; the rotation of the face-plate being effected by the mandrel, it is compelled by its gibs totravel around the disk, its ways f sliding freelyI on the slide D in its gyration,` and thus describe a perfect oval at any point on the face of the wood; by setting the circular disk to or from the mandrel, ovals of any degree of eccentricity may be described; by making the center of the disk coincident with that of the mandrel, a circle would be produced.

G is a slide-rest on the front of the frame, carrying lthe cutter-head H, to which are bolted the cutters or knives I, the peculiarit-y of which is that their cutting edges are all on one radialline,'as shown infg. 4,ren

dered necessary from the fact that if the knives were made as are ordinary-molding-irons, with one point varying in height with another, a confusion ofovals would be the result, the block describing at each point of the cutting edge an oval whose radius differs from that of each other point of depression or elevation in the knife, consequently there would be as many dit'- ferent ovals desciibed as there are elevations or depressions in the knife.

J is a metallic cap conforming in outline t0 the contour of the knives, whose edges it nearly covers, and is secured at its ends by proper bolts to vthe top of the cutter-head; the small space between its lower edge and the edge of the knives forms a throat through which passes the shavings taken from the wood.

The object of the cap is to regulate the thickness of the shaving taken from the wood without it the knives would dig into the wood, taking off chips instead of shavin gs, resulting iu thespoiling of the frame.

By the employment of the knives of the peculiar construction described, and the use of the cap, perfect framesv of uniform size are produced at one operation from rough boards, without previous sawing or shaping.

That I claim as my invention, and desire to secure by Letters Patent, is-

1. The metallic cap J, as described, and operating as and for the purpose set forth.

2. In combinationwiththe metallic capJ, the knives I, arranged upon the cutter-head as described, and operating as and for the purpose set forth.

' JOHN L. WARREN.

Witnesses:

H. F. Ennn'rs, J As. I. DAY. 

